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Thanks for comments - the PCB bord was replaced last year, so that might have been the reason why it now bangs every time it shuts down. Will try another pluimber

Our combi about 10 years old has been makes a banging noise when starting up and cutting out. We have been told it is the gas pressure and we need to know the correct setting for the boiler from tech instructions. Can anyone help? What do you adjust? We are in a block of 3 flats - the other two...